Frequency synthesizer having microcomputer supplying analog and

Details Frequency synthesizer having microcomputer supplying analog and Frequency synthesizer having microcomputer supplying analog and

1991-11-12

1993-01-26

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 17, 331 25, 331 34, 331167, 331179, H03L 7085, H03L 7099

Patent

active

051825287

ABSTRACT:
A frequency synthesizer includes an oscillator which may be coarse-tuned by a first input receiving a digital signal for selecting one of a plurality of frequency ranges, and fine-tuned by a second input receiving an analog signal for selecting the desired frequency within the selected frequency range. The synthesizer further includes a computer storing the oscillator's characteristics in the form of a digital table of the input signals corresponding to a plurality of frequency values, each identified by digital data. The computer receives input data representing the desired oscillator frequency and generates from the stored digital table, a digital signal indicating the frequency range of the desired oscillator frequency, and an analog signal indicating the specific oscillator frequency desired, and applies both signals to the oscillator. A frequency measuring circuit measures the actual output frequency of the oscillator and outputs a signal corresponding thereto. This signal is fed back to the computer for controlling, in response thereto, the digital and analog signals generated by the computer.

REFERENCES:
patent: 4450518 (1984-05-01), Klee
patent: 4503401 (1985-03-01), Kyriakos et al.
patent: 4646030 (1987-02-01), Hollister
patent: 4906944 (1990-03-01), Frerking
patent: 5053723 (1991-10-01), Schemmel

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